/Engine/Source/Runtime/Interchange/Core/Public/InterchangePipelineBase.h
This function should return true if all the pipeline settings are in a valid state to start the import. The Interchange Pipeline Configuration Dialog will call this to know if the Import button can be enable.
virtual bool IsSettingsAreValid ( [TOptional](API\Runtime\Core\IO\TOptional)< [FText](API\Runtime\Core\Internationalization\FText) > & OutInvalidReason ) const